When I remember I equalize with our B&D 40 amp portable smart charger, maybe twice a year. Rest of the time our Iota IQ4 takes care of our 6 volt GC2 batteries which has it's own equalizing routines @ 14.8Vdc. Since our rig is plugged in 24/7 when not on the road our batteries are always in a fully charged state, last set went 7 years and they still had juice in them although I replaced them for a set with more total amphours last season.